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| author | Anthony Steinhauser <asteinhauser@google.com> | 2020-06-07 15:44:19 +0300 |
|---|---|---|
| committer | Thomas Gleixner <tglx@linutronix.de> | 2020-06-09 11:50:55 +0300 |
| commit | 4d8df8cbb9156b0a0ab3f802b80cb5db57acc0bf (patch) | |
| tree | 0b12815b3168562c696e346601624c8c469a6711 /tools/perf/scripts/python/export-to-postgresql.py | |
| parent | dbbe2ad02e9df26e372f38cc3e70dab9222c832e (diff) | |
| download | linux-4d8df8cbb9156b0a0ab3f802b80cb5db57acc0bf.tar.xz | |
x86/speculation: PR_SPEC_FORCE_DISABLE enforcement for indirect branches.
Currently, it is possible to enable indirect branch speculation even after
it was force-disabled using the PR_SPEC_FORCE_DISABLE option. Moreover, the
PR_GET_SPECULATION_CTRL command gives afterwards an incorrect result
(force-disabled when it is in fact enabled). This also is inconsistent
vs. STIBP and the documention which cleary states that
PR_SPEC_FORCE_DISABLE cannot be undone.
Fix this by actually enforcing force-disabled indirect branch
speculation. PR_SPEC_ENABLE called after PR_SPEC_FORCE_DISABLE now fails
with -EPERM as described in the documentation.
Fixes: 9137bb27e60e ("x86/speculation: Add prctl() control for indirect branch speculation")
Signed-off-by: Anthony Steinhauser <asteinhauser@google.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: stable@vger.kernel.org
Diffstat (limited to 'tools/perf/scripts/python/export-to-postgresql.py')
0 files changed, 0 insertions, 0 deletions